After 5 years you should just assume you've extracted all useful life out of it and will need to repaint. 

To know you would need to extract the information that they would be interested in getting.

It will cost several hundreds to $1k, or even $2,500 retainer fee, but I bet you can extract a lot more money from three of them for fraud.

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National tenants take more legwork.Unless your location is superior they try to exert more leverage then local tenants to pick your spot to lease from.If your site is a maybe site instead of a definite for them then usually try to extract more concessions out of you.LOI is not concrete.

@Dan P. try zillow api http://www.zillow.com/howto/api/APIOverview.htm here is an example vba - http://johnmann.me/excel-zillow-api-extraction/ 

But median rent is one thing and the amount of pain you have to go through in order to extract it is another.Is there a good tool out there for analyzing neighborhoods or several square blocks for things like average credit score/rental turnover, etc? 

I haven't found any sustainability buying from other wholesalers because they are extracting much of your potential profits when you buy.

As far as talking to heirs I just feel it out try to ask sincere questions and extract intel.

We hired a plumber and the drainage issue was quick fixed, and water extracted.